Antenna device and display device

Abstract

The present invention provides an antenna device and a display device. According to one aspect, the antenna device includes: a dielectric layer; a radiator formed on the dielectric layer; and a transmission line connected to the radiator on the dielectric layer and forming a mesh structure comprising a plurality of unit cells defined by conductive lines. The width of the transmission line can be an integer multiple of the width of the unit cell and can be within an acceptable error range.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2020-0090448 filed on July 21, 2020, in the Korean Intellectual Property Office (KIPO), the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present invention relates to an antenna device and a display device. Background Art

[0004] Recently, according to the development of information society, wireless communication technologies such as Wi-Fi, Bluetooth, etc. are implemented in the form of smart phones by being combined with display devices. In this case, an antenna can be coupled to the display device to perform a communication function.

[0005] Recently, as mobile communication technology has become more advanced, it has become necessary to couple an antenna that performs communication in a high frequency band or an ultra-high frequency band to a display device. In addition, with the development of thin, highly transparent, and high-resolution display devices such as transparent and flexible displays, it is necessary to develop an antenna that also has improved transparency and flexibility.

[0006] As display screen sizes increase, the space or area available for bezels or light-shielding areas has decreased. This limits the space or area available for antennas, potentially causing the antenna's radiator, which transmits and receives signals, to overlap with the display area. Consequently, the display image may be obscured by the antenna's radiator or become visible to the user, degrading image quality.

[0007] Therefore, there is a need to design an antenna for achieving high-frequency communication with a desired antenna gain in a limited space without being seen by a user. Summary of the Invention

[0008] An object of the present invention is to provide an antenna device and a display device including the antenna device.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0010] 1. An antenna device comprising: a dielectric layer; a radiator formed on the dielectric layer; and a transmission line connected to the radiator on the dielectric layer and formed into a mesh structure, the mesh structure being a combination of unit cells defined by a plurality of conductive lines, wherein a width of the transmission line is an integer multiple of a width of the unit cell and is within an allowable error range.

[0011] 2. The antenna device according to 1 above, wherein the width of the transmission line satisfies the following equation 1:

[0012] [Equation 1]

[0013] (n-0.2)×b≤a≤(n+0.2)×b,

[0014] where n is an integer, b is the width of the unit cell, and a is the width of the transmission line.

[0015] 3. The antenna device according to item 1 above, further comprising: a signal pad connected to an end portion of the transmission line; and a ground pad provided around the signal pad and separated from the signal pad.

[0016] 4. The antenna device according to 3 above, wherein the signal pad or the ground pad is formed as a solid structure.

[0017] 5. The antenna device according to 3 above, wherein the ground pad includes a pair of ground pads facing each other with the signal pad interposed therebetween.

[0018] 6. The antenna device according to item 1 above, further comprising a dummy pattern provided around the radiator and the transmission line on the dielectric layer and electrically separated from them.

[0019] 7. The antenna device according to 6 above, wherein the radiator and the dummy pattern are formed into a mesh structure.

[0020] 8. The antenna device according to 1 above, further comprising a ground layer formed on the lower surface of the dielectric layer.

[0021] According to an embodiment of the present invention, by determining the width of a transmission line in consideration of the width of a unit cell forming a mesh structure, signal loss in the transmission line where current concentrates during power supply can be prevented, thereby improving antenna gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description made in conjunction with the accompanying drawings, in which:

[0023] Figure 1 is a schematic cross-sectional view showing an antenna device according to one embodiment;

[0024] Figure 2 is a schematic plan view showing an antenna device according to one embodiment;

[0025] Figure 3 and Figure 4 It is a view used to describe the x-direction width of the transmission line;

[0026] Figure 5is a schematic plan view showing an antenna device according to another embodiment;

[0027] Figure 6 is a schematic plan view for describing a display device according to one embodiment;

[0028] Figure 7 is a view showing a transmission line according to Experimental Example 1; and

[0029] Figure 8 is a view showing a transmission line according to Experimental Example 2. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. When assigning reference numerals to components of the various drawings, it should be noted that the same components are assigned the same reference numerals even though they are shown in different drawings.

[0031] In the description of the preferred embodiments of the present invention, well-known functions and configurations that are considered to be able to unnecessarily obscure the main purpose of the present invention will not be described in detail. In addition, the terms described below are defined in consideration of the functions of the embodiments and may vary depending on the intentions of the user, operator, or customer. Therefore, such terms should be defined based on the contents of the entire specification.

[0032] It should be understood that although the terms first, second, etc. may be used herein to describe various elements or components, these elements or components should not be limited by these terms. As used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprises", "comprising", "includes", and / or "comprising" when used herein indicate the presence of the described features, integers, steps, operations, elements, components, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof.

[0033] In addition, directional terms such as "one side," "the other side," "upper," and "lower" are used relative to the orientation of the disclosed drawings. Because elements or components of embodiments of the present invention can be positioned in various orientations, these directional terms are used for illustrative purposes and are not intended to limit the present invention thereto.

[0034] In addition, the division of the structural units in the present disclosure is for the convenience of description and is distinguished only by the main functions set for each structural unit. That is, two or more structural units to be described below can be combined into a single structural unit, or can be formed into more than one structural unit through two or more functional divisions. In addition, in addition to being responsible for the main functions, each structural unit to be described below can also additionally perform some or all of the functions set for other structural units, and some of the main functions set for each structural unit can be exclusively adopted, and of course can also be performed by other structural units.

[0035] The antenna element described in the present disclosure may be a patch antenna or a microstrip antenna manufactured in the form of a transparent film. For example, the antenna element can be applied to electronic devices for high frequency or ultra-high frequency (e.g., 3G, 4G, 5G or higher) mobile communications, Wi-Fi, Bluetooth, near field communication (NFC), global positioning system (GPS), etc., but is not limited thereto. Here, the electronic device may include a mobile phone, a smart phone, a tablet computer, a laptop computer, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, an MP3 player, a digital camera, a wearable device, etc. The wearable device may include a watch type, a wristband type, a ring type, a belt type, a necklace type, an ankle band type, a thigh band type, a forearm band type wearable device, etc. However, the electronic device is not limited to the above examples, and the wearable device is not limited to the above examples.

[0036] In the following figures, two directions parallel to the upper surface of the dielectric layer and perpendicular to each other are defined as the x-direction and the y-direction, and the direction perpendicular to the upper surface of the dielectric layer is defined as the z-direction. For example, the x-direction may correspond to the width of the antenna element, the y-direction may correspond to the length of the antenna element, and the z-direction may correspond to the thickness of the antenna element.

[0037] Figure 1 is a schematic cross-sectional view showing an antenna device according to one embodiment, Figure 2 is a schematic plan view showing an antenna device according to one embodiment.

[0038] Reference Figure 1 and Figure 2 , the antenna device may include a dielectric layer 110 and an antenna conductive layer 120 .

[0039] The dielectric layer 110 may include an insulating material having a predetermined dielectric constant. According to one embodiment, the dielectric layer 110 may include an inorganic insulating material such as glass, silicon oxide, silicon nitride, or metal oxide, or an organic insulating material such as epoxy resin, acrylic resin, or imide resin. The dielectric layer 110 may serve as a thin film substrate for the antenna device on which the antenna conductive layer 120 is formed.

[0040] According to one embodiment, a transparent film may be provided as the dielectric layer 110. In this case, the transparent film may include a polyester resin such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene terephthalate, etc.; a cellulose resin such as diacetyl cellulose, triacetyl cellulose, etc.; a polycarbonate resin; an acrylic resin such as polymethyl (meth)acrylate, polyethyl (meth)acrylate, etc.; a styrene resin such as polystyrene, acrylonitrile-styrene copolymer, etc.; a polyolefin resin such as polyethylene, polypropylene, a cyclic polyolefin or a polyolefin having a norbornene structure, an ethylene-propylene copolymer, etc.; a vinyl chloride resin; an amide resin such as nylon, aromatic polyamide; an imide resin; a polyether sulfonic acid resin; a sulfonic acid resin; a polyether ether ketone resin; a polyphenylene sulfide resin; a vinyl alcohol resin; a vinylidene chloride resin; a vinyl butyral resin; an allyl compound resin; a polyoxymethylene resin; a thermoplastic resin such as an epoxy resin, etc. These compounds may be used alone or in combination of two or more. In addition, a transparent film made of a thermosetting resin or an ultraviolet curing resin such as (meth)acrylate, urethane, acrylic urethane, epoxy resin, silicone resin, etc. may be used as the dielectric layer 110 .

[0041] According to one embodiment, an adhesive film such as an optically clear adhesive (OCA), an optically clear resin (OCR), etc. may be further included in the dielectric layer 110 .

[0042] According to one embodiment, the dielectric layer 110 may be formed as a substantially single layer, or may be formed as a multi-layered structure of two or more layers.

[0043] The dielectric layer 110 can form capacitance or inductance, thereby adjusting the frequency band that can be driven or sensed by the antenna device. When the dielectric constant of the dielectric layer 110 exceeds approximately 12, the driving frequency is excessively reduced, and it may be impossible to drive the antenna in the desired high frequency band. Therefore, according to one embodiment, the dielectric constant of the dielectric layer 110 can be adjusted to a range of approximately 1.5 to 12, preferably approximately 2 to 12.

[0044] According to one embodiment, an insulating layer inside the display device on which the antenna device is mounted (eg, an encapsulation layer, a passivation layer, etc. of the display panel) may be provided as the dielectric layer 110 .

[0045] The antenna conductive layer 120 is formed on the dielectric layer 110 and may have an antenna pattern 200 including a radiator 210 and a transmission line 220 , and a pad electrode 230 .

[0046] The antenna pattern 200 may include a low-resistance metal such as silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), titanium (Ti), tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), tin (Sn), molybdenum (Mo), calcium (Ca), or an alloy containing at least one of these metals. They can be used alone or in combination of two or more. For example, the antenna pattern 200 may include silver (Ag) or a silver alloy (e.g., a silver-palladium-copper (APC) alloy) to achieve low resistance. As another example, considering low resistance and a thin line width pattern, the antenna pattern 200 may include copper (Cu) or a copper alloy (e.g., a copper-calcium (CuCa) alloy).

[0047] According to one embodiment, the antenna pattern 200 may include a transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), zinc oxide (ZnOx), or copper oxide (CuO).

[0048] According to one embodiment, the antenna pattern 200 can be formed as a single-layer structure of a metal layer or a stacked structure of a transparent conductive oxide layer and a metal layer. For example, the antenna pattern 200 can have a double-layer structure of a transparent conductive oxide layer and a metal layer, or a triple-layer structure of a transparent conductive oxide layer, a metal layer, and a transparent conductive oxide layer. In this case, the metal layer can reduce resistance to increase signal transmission speed and improve flexibility, while the transparent conductive oxide layer can also improve corrosion resistance and transparency.

[0049] According to an exemplary embodiment, the antenna pattern 200 may include a blackened portion, thereby reducing reflection on the surface of the antenna pattern 200 and reducing visibility of the pattern due to light reflection.

[0050] According to one embodiment, the surface of the metal layer included in the antenna pattern 200 is converted into a metal oxide or metal sulfide to form a blackened layer. According to one embodiment, a blackened layer such as a black material coating or plating layer may be formed on the antenna pattern 200 or the metal layer. Here, the black material coating or plating layer may include silicon, carbon, copper, molybdenum, tin, chromium, nickel, cobalt, or an oxide, sulfide, or an alloy containing at least one of these.

[0051] The composition and thickness of the blackened layer may be adjusted in consideration of the effect of reducing reflection.

[0052] Radiator 210 can transmit or receive signals to or from the outside. For example, radiator 210 can transmit / receive signals at a resonant frequency. The y-direction length and x-direction width of radiator 210 can be determined based on the desired resonant frequency, radiation resistance, and gain.

[0053] The radiator 210 may be formed into a mesh structure defined by a plurality of conductive lines. This may increase the light transmittance of the radiator 210 and improve the flexibility of the antenna device. Therefore, the antenna device may be effectively applied to a flexible display device.

[0054] According to one embodiment, Figure 2 As shown, the radiator 210 may be implemented in a diamond shape. However, this is just an example, and there is no particular limitation on the shape of the radiator 210. That is, the radiator 210 may be implemented in various shapes, such as a rectangle, a circle, and the like.

[0055] The transmission line 220 may be provided between the radiator 210 and the signal pad 231 of the pad electrode 230 to electrically connect the radiator 210 and the signal pad 231. For example, the transmission line 220 may branch from the central portion of the radiator 210 and connect to the signal pad 231.

[0056] The transmission line 220 may be formed into a mesh structure defined by a plurality of conductive lines. For example, the transmission line 220 may be formed into a mesh structure having substantially the same shape as the radiator 210 (eg, the same line width, the same interval, etc.).

[0057] The x-direction width of the transmission line 220 can be determined by considering the x-direction width of the unit cells forming the mesh structure. For example, the x-direction width of the transmission line 220 can be an integer multiple of the x-direction width of the unit cells forming the mesh structure and can be within an allowable error range. More preferably, the x-direction width of the transmission line 220 is an integer multiple of the x-direction width of the unit cells.

[0058] As the intersections of multiple conductive lines (e.g. Figure 3 and Figure 4 As the number of cross points (indicated by the dotted circle) increases, the conductivity of the mesh structure increases. Therefore, by forming the x-direction width of transmission line 220 to an integer multiple of the x-direction width of the unit cell so that transmission line 220 includes as many cross points as possible, signal loss in transmission line 220 can be prevented.

[0059] The following will refer to Figure 3 and Figure 4 The x-direction width of the transmission line 220 is described in detail.

[0060] According to one embodiment, the transmission line 220 may include substantially the same conductive material as the radiator 210. In addition, the transmission line 220 may be integrally connected with the radiator 210 to be provided as a substantially single member, or may be provided as a member separate from the radiator 210.

[0061] At the same time, if Figure 2 As shown, the radiator 210 and the transmission line 220 may include edge conductive lines 201 formed on edge portions of the radiator 210 and the transmission line 220, but are not limited thereto. That is, the edge conductive lines 201 may be formed on edge portions of the radiator 210 and / or the transmission line 220. For example, as described below, a dummy pattern may be provided around the radiator 210 and the transmission line 220, and the dummy pattern may be separated from the radiator 210 and the transmission line 220 to form an edge without separate edge conductive lines 201.

[0062] The pad electrode 230 may include a signal pad 231 and a ground pad 232 .

[0063] The signal pad 231 can be connected to the end of the transmission line 220, thereby being electrically connected to the radiator 210 through the transmission line 220. Thus, the signal pad 231 can electrically connect a driving circuit unit (e.g., an integrated circuit (IC)) and the radiator 210. For example, a circuit board such as a flexible printed circuit board (FPCB) can be bonded to the signal pad 231, and the driving circuit unit can be mounted on the circuit board. Thus, the radiator 210 and the driving circuit unit can be electrically connected to each other.

[0064] The ground pad 232 may be provided around the signal pad 231 to be electrically and physically separated from the signal pad 231. For example, a pair of ground pads 232 facing each other with the signal pad 231 interposed therebetween may be provided.

[0065] According to one embodiment, in order to reduce signal resistance, the signal pad 231 and the ground pad 232 can be formed into a solid structure including the above-mentioned metal or alloy. In this case, the signal pad 231 and the ground pad 232 can be formed into a multilayer structure including a layer of the above-mentioned metal or alloy and a transparent conductive oxide layer.

[0066] According to one embodiment, the antenna device may further include a ground layer 105. Since the antenna device includes the ground layer 105, vertical radiation characteristics may be achieved.

[0067] The ground layer 105 may be formed on the lower surface of the dielectric layer 110. The ground layer 105 may be disposed to entirely or partially overlap the antenna conductive layer 120 with the dielectric layer 110 interposed therebetween. For example, the ground layer 105 may overlap a radiator of the antenna conductive layer 120.

[0068] According to one embodiment, a conductive member of a display device or display panel equipped with an antenna device may be provided as the ground layer 105. For example, the conductive member may include electrodes or wirings, such as gate electrodes, source / drain electrodes, pixel electrodes, common electrodes, data lines, scan lines, etc. of thin film transistors (TFTs) included in the display panel, as well as stainless steel (SUS) plates, heat sinks, digitizers, electromagnetic shielding layers, pressure sensors, fingerprint sensors, etc. of the display device.

[0069] At the same time, for the convenience of description, Figure 2 Only one antenna device is shown in the figure, but a plurality of antenna devices may be arranged in an array on the dielectric layer 110. The arrangement of the antenna devices may include a linear arrangement or a non-linear arrangement.

[0070] Figure 3 and Figure 4 It is a view used to describe the x-direction width of the transmission line. Specifically, Figure 3 shows the case where the tilt angle of the unit cell relative to the y direction is 0, and Figure 4 The case where the tilt angle of the unit cell with respect to the y direction is not 0 is shown.

[0071] Reference Figures 2 to 4 , the mesh structure forming the radiator 210 and the transmission line 220 may be formed by a plurality of conductive lines 310 crossing each other.

[0072] The mesh structure includes unit cells 330 defined as a plurality of conductive lines 310 substantially intersecting in a honeycomb shape, and a plurality of unit cells 330 may be combined to define the mesh structure.

[0073] According to one embodiment, the unit cell 330 may have a substantially rhombus shape.

[0074] As described above, the x-direction width a of the transmission line 220 may be determined considering the x-direction width b of the unit cells 330 forming the mesh structure. For example, the x-direction width a of the transmission line 220 is an integer multiple of the x-direction width b of the unit cells 330 forming the mesh structure and may be within an allowable error range.

[0075] More specifically, the x-direction width a of the transmission line 220 may be determined within a range satisfying the following Equation 1.

[0076] [Equation 1]

[0077] (n-0.2)×b≤a≤(n+0.2)×b

[0078] Here, n may be an integer, b may be the width of the unit cell 330, and a may be the width of the transmission line 220. In addition, 0.2 may be a value for setting an allowable error range in consideration of a processing error.

[0079] More preferably, the x-direction width a of the transmission line 220 may be an integer multiple of the x-direction width b of the unit cells 330 forming the mesh structure.

[0080] More specifically, the x-direction width a of the transmission line 220 may be determined to satisfy Equation 2 below.

[0081] [Equation 2]

[0082] A=n×b

[0083] According to one embodiment, by determining the x-direction width a of the transmission line 220 to satisfy the above equation 1 and more preferably satisfy the above equation 2, signal loss in the transmission line 220 where current is concentrated during power supply can be prevented, thereby improving antenna gain.

[0084] Figure 5 is a schematic plan view showing an antenna device according to another embodiment.

[0085] Reference Figure 1 and Figure 5 The antenna device may include an antenna conductive layer 120 formed on a dielectric layer 110, and the antenna conductive layer 120 may have an antenna pattern 200 including a radiator 210 and a transmission line 220, a pad electrode 230, and a dummy pattern 510. Here, the radiator 210, the transmission line 220, and the pad electrode 230 are similar to those in the reference Figures 1 to 4 Those in the described configurations are the same, so the same configurations will not be described in detail.

[0086] The dummy pattern 510 may be disposed around the antenna pattern 200 including the radiator 210 and the transmission line 220 .

[0087] The dummy pattern 510 may be formed in a mesh structure having substantially the same shape (e.g., the same line width and the same interval, etc.) as the radiator 210 or the transmission line 220, and may include the same metal as the radiator 210 or the transmission line 220. According to one embodiment, a portion of the conductive line forming the dummy pattern 510 may be segmented.

[0088] The dummy pattern 510 can be provided to be electrically and physically separated from the antenna pattern 200 and the pad electrode 230. For example, a separation region 511 can be formed along the edge or outline of the antenna pattern 200 to separate the dummy pattern 510 and the antenna pattern 200 from each other. In other words, the dummy pattern 510 can be provided around the antenna pattern 200, and the antenna pattern 200 and the dummy pattern 510 can be separated from each other to form the separation region 511. As a result, the antenna pattern 200 can be formed without a separate edge conductive line.

[0089] As described above, by providing the dummy pattern 510 having substantially the same mesh structure as the radiator 210 or the transmission line 220 around the antenna pattern 200, a user of a display device equipped with the antenna device may be prevented from viewing the antenna pattern.

[0090] At the same time, for the convenience of description, Figure 5 Only one antenna pattern is shown, but a plurality of antenna devices may be provided in an array on the dielectric layer 110. The arrangement of the antenna devices may include a linear arrangement or a non-linear arrangement.

[0091] Figure 6 is a schematic plan view for describing a display device according to one embodiment. More specifically, Figure 6 is a view showing an external shape of a window including a display device.

[0092] Reference Figure 6 The display device 600 may include a display area 610 and a peripheral area 620. The display area 610 may represent an area where visual information is displayed, and the peripheral area 620 may represent an opaque area disposed on both sides and / or ends of the display area 610. For example, the peripheral area 620 may correspond to a light-shielding portion or a frame portion of the display device 600.

[0093] According to one embodiment, the antenna device described above may be mounted on a display device 600. For example, the antenna pattern 200 of the antenna device may be disposed to at least partially correspond to a display area 610 of the display device 600, and the pad electrode 230 may be disposed to correspond to a peripheral area 620 of the display device 600. In this case, the antenna pattern 200, in particular, a portion of the transmission line 220, may be disposed to correspond to the peripheral area 620 of the display device 600.

[0094] A driving circuit such as an IC chip of the display device 600 and / or the antenna device may be provided in the peripheral area 620 .

[0095] By disposing the pad electrode 230 of the antenna device close to the driving circuit, signal loss can be suppressed by shortening the path for transmitting and receiving signals.

[0096] When the antenna device includes the dummy pattern 510 , the dummy pattern 510 may be disposed to at least partially correspond to the display area 610 of the display device 600 .

[0097] The antenna device includes antenna patterns and / or dummy patterns formed into a mesh structure, thereby significantly reducing or preventing the pattern from being seen while improving light transmittance. Therefore, the image quality in the display area 610 can also be improved while maintaining or improving the desired communication reliability.

[0098] The present invention has been described above with reference to preferred embodiments, and those skilled in the art will appreciate that various modifications may be made without departing from the essential features of the present invention. Therefore, it should be understood that the scope of the present invention is not limited to the above-described embodiments, and that various other embodiments within the scope equivalent to the scope of the claims are also encompassed within the present invention.

[0099] [Experimental Example 1]

[0100] according to Figure 2 and Figure 7 The design shown in FIG1 forms a 1×2 array antenna into a mesh structure in which the tilt angle of the unit cell is 0. Specifically, an antenna pattern having a mesh structure is formed on the upper surface of a glass (0.7T) dielectric layer using an alloy (APC) of silver (Ag), palladium (Pd) and copper (Cu), and then APC is deposited on the lower surface of the dielectric layer to form a ground layer. The conductive lines included in the mesh structure are formed to have a line width of 3 μm, The thickness (or height) of the conductive line was 100 μm, and the distance between the conductive line and the ground layer was 380 μm. The unit cell width was fixed at 100 μm, and the transmission line widths were set to 300 μm, 260 μm, and 340 μm, respectively, to form antenna patterns for Example 1, Comparative Example 1, and Comparative Example 2. Their antenna gains were then measured at 28 GHz. The measurement results are shown in Table 1 below.

[0101] [Table 1]

[0102]

[0103] Reference Figure 7 From Table 1, it can be seen that in the examples of the antenna patterns of Comparative Examples 1 and 2 in which the ratio of the transmission line width to the unit cell width is 2.6 and 3.4, the antenna gains are 2.71 and 2.92, respectively, while in the example of the antenna pattern of Example 1 in which the ratio of the transmission line width to the unit cell width is an integer 3, the antenna gain is 3.12.

[0104] In addition, it can be seen that the antenna patterns of Example 1 and Comparative Example 2 have the same number of cross points included in the transmission line ( Figure 7 ), but compared with the antenna pattern of Example 1, the antenna pattern of Comparative Example 2 has a larger area occupied by the transmission line and a smaller antenna gain.

[0105] Furthermore, it was confirmed that by forming the transmission line width to an integral multiple of the unit cell width, signal loss in the transmission line can be prevented and antenna gain can be improved.

[0106] [Experimental Example 2]

[0107] according to Figure 2 and Figure 8 The design shown in FIG1 forms a 1×2 array antenna into a mesh structure with a tilt angle of 4 in the unit cell. Specifically, an antenna pattern having a mesh structure is formed on the upper surface of a glass (0.7T) dielectric layer using an alloy (APC) of silver (Ag), palladium (Pd) and copper (Cu), and then APC is deposited on the lower surface of the dielectric layer to form a ground layer. The conductive lines included in the mesh structure are formed to have a line width of 3 μm, The thickness (or height) of the conductive line was 100 μm, and the distance between the conductive line and the ground layer was 380 μm. The unit cell width was fixed at 100 μm, and the transmission line widths were set to 300 μm, 260 μm, and 340 μm, respectively, to form antenna patterns for Example 2, Comparative Example 3, and Comparative Example 4. Their antenna gains were then measured at 28 GHz. The measurement results are shown in Table 2 below.

[0108] [Table 2]

[0109]

[0110] Reference Figure 8 From Table 2, it can be seen that in the examples of the antenna patterns of Comparative Examples 3 and 4 in which the ratio of the transmission line width to the unit cell width is 2.6 and 3.4, the antenna gains are 2.22 and 2.50, respectively, while in the example of the antenna pattern of Example 2 in which the ratio of the transmission line width to the unit cell width is an integer 3, the antenna gain is 2.67.

[0111] In addition, it can be seen that the antenna pattern of Comparative Example 3 has the intersection point ( Figure 8 The number of the antenna pattern (dashed line portion in the figure) is greater than that of the antenna pattern of Example 2, but compared with the antenna pattern of Example 2, the antenna pattern of Comparative Example 3 has a larger area occupied by the transmission line and a smaller antenna gain.

[0112] Furthermore, it was confirmed that by forming the transmission line width to an integral multiple of the unit cell width, signal loss in the transmission line can be prevented and antenna gain can be improved.

Claims

1. An antenna device, characterized in that: It includes: dielectric layer; a radiator formed on the dielectric layer; as well as a transmission line connected to the radiator on the dielectric layer and formed into a mesh structure, the mesh structure being a combination of unit cells defined by a plurality of conductive lines, The width of the transmission line satisfies 2.8≤a / b≤3.2, where b is the width of the unit cell, and a is the width of the transmission line, wherein the width of the unit cell is constant, and The radiator and the unit cell are in a rhombus shape.

2. The antenna device according to claim 1, wherein It also includes: a signal pad connected to an end of the transmission line; and A ground pad separated from the signal pad is arranged around the signal pad.

3. The antenna device according to claim 2, wherein: The signal pad or the ground pad is formed as a solid structure.

4. The antenna device according to claim 2, wherein: The ground pad includes a pair of the ground pads facing each other with the signal pad interposed therebetween.

5. The antenna device according to claim 1, wherein The invention further includes a dummy pattern which is disposed around the radiator and the transmission line on the dielectric layer and is electrically separated from them.

6. The antenna device according to claim 5, characterized in that The radiator and the dummy pattern are formed into a mesh structure.

7. The antenna device according to claim 1, wherein It also includes a ground layer formed on the lower surface of the dielectric layer.

8. A display device, characterized in that: It comprises the antenna device according to claim 1 .

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